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Finding the Fourth Proportional to 710.78, 980.78 and 396.02

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Solution

The fourth proportional to 710.78, 980.78 and 396.02 is: 546.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    710.78 : 980.78 = 396.02 : x
  2. Step 2: Convert to fraction form
    710.78/980.78 = 396.02/x
  3. Step 3: Cross multiply
    710.78x = 980.78 × 396.02
  4. Step 4: Simplify right side
    710.78x = 388,408.50
  5. Step 5: Solve for x
    x = 388,408.50/710.78
  6. Step 6: Final answer
    x = 546.45

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.